spm chemistry paper 2 exercise

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    Greenish yellow gas

    Gas berwarna kuning

    kehijauan

    Section A

     [60 marks]

    Answer all questions in this section.

    1 Diagram 2 shows the apparatus set-up to investigate the electrolysis of 2.0 mol m-!

     potassium chlorie solution. "reenish yellow gas #u##les is collecte at electroe $.

    Diagram 2

    %a& 'hat is meant #y electrolysis(

    ................................................................................................................................

    ................................................................................................................................

    [) mark]

    %#& 'rite the formulae for all ions that are present in potassium chlorie solution.

    ................................................................................................................................

    [) mark]

    %c& %i& *ame the gas collecte at electroe $.

    .........................................................................................................................

    [) mark]

    %ii& 'hy is the gas prouce at electroe $. +,plain your answer in terms of

    selective ischarge of ions.

    .........................................................................................................................

    .........................................................................................................................

    [2 marks]

    %& %i& Another gas prouce at electroe . 'rite the half equation for the

    )

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    Carbon electrode Y 

    Karbon elektrod  Y 

    reaction at the electroe .

    .........................................................................................................................

    [) mark]

    %ii& tate the o#servation at the electroe .

    .........................................................................................................................

    [) mark]

    %iii& Descri#e a test to confirm the gas prouce at electroe .

    .........................................................................................................................

    .........................................................................................................................

    [2 marks]

    %e& /he e,periment is repeate with 0.000) mol m-! potassium chlorie solution.

    At which electroe the prouct forme will #e ifferent(

    ................................................................................................................................

    [) mark]

    2. Diagram 2.) shows an aeroplane an a polystyrene cup.

     

    Diagram 2.)

    %a& %i& /he #oy of aeroplane is mae from uralumin. Aluminium is one of the

    elements in uralumin. tate two other elements in uralumin.

    .........................................................................................................................

    [2 marks]

    %ii& +,plain in terms of arrangement of atoms why uralumin is stronger an

    2

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    harer than pure aluminium.

    .........................................................................................................................

    .........................................................................................................................

    .........................................................................................................................

    .........................................................................................................................

    [! marks]

    %#& /he polystyrene cup is mae from a synthetic polymer polyphenylethene.

    %i& tate the name of the monomer for polyphenylethene.

    .........................................................................................................................

    [) mark]

    %ii& Diagram 2.2 shows the structural formula for the polyphenylethene.

    Diagram 2.2

    Draw the structural formula for the monomer of polyphenylethene.

    [) mark]

    %iii& 1t is avisa#le that we shoul not a hot foo or hot rinks to polystyrene.

    +,plain why.

    .........................................................................................................................

    [) mark]

    %iv& tate one  reason why polystyrene cup shoul not #e ispose #y open

     #urning(

    .........................................................................................................................

    [) mark]

    !. +thanoic aci is a weak aci. Diagram ! shows a la#el of a reagent #ottle which

    !

    n634 634634634634634

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    Potassi

    Larutan

    Carbon electrode X

    Elektrod karbon X

    A

    containing ethanoic aci.

    Diagram !

    %a& 'hat is the meaning of aci(

    ..555555555555555555555555555555......

    [) mark]

    %#& +,plain why aci is a weak aci.

    ......555555555555555555555555555555....

      [) mark]%c& 'hen a piece of magnesium strip is put into aci effervescence occurs.

    'rite a #alance chemical equation for the reaction.

    ................................................................................................................................

    [2 marks]

    %& 24 cm! of 0.) mol m-! soium hyro,ie solution is put in a conical flask.

    /hen a few rops of phenolphthalein are ae. /his solution is titrate with

    0.) mol m-! solution .

    %i& tate the type of reaction #etween soium hyro,ie solution an solution

    .

    ........55..5555555555555555555555555....

    [) mark]

    %ii& 'hat is the colour change of the mi,ture at the en point(

    ..........................................................................................................................

    .

    [) mark]

     %iii& 'rite a #alance chemical equation for the reaction occurs in %&.

    ........555555555555555555555555555......

    [) mark]

    %iv& alculate the volume of aci use.

      [! marks]

    7

    u#stance 8 9rganic aci

    oncentration 8 0.) mol m-!

    :ormula 8 3!993

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    7. Diagram 7 shows the flow chart of a series of reactions of copper%11& car#onate

    salt.

    Diagram 7

    %a& opper%11& car#onate react with sulphuric aci to prouce salt L gas M an

    water. "as M turns lime water chalky.

    ;ase on Diagram 7 ientify salt L an gas M.

    alt < 8 ......................................................................................................

    "as = 8 ......................................................................................................[2 marks]

     %#& 'hen salt L  solution is ae with soium hyro,ie solution a #lue

     precipitate insolu#le in e,cess soium hyro,ie solution forme. *ame the

     #lue precipitate.

    ................................................................................................................................

    [) mark]

    %c& alt < can #e converte #ack to copper%11& car#onate through reaction W.

    %i& uggest a suita#le chemical su#stance that can #e use in reaction '

    .........................................................................................................................

    [) mark]

    %ii& tate the name of reaction '.

    .........................................................................................................................

    [) mark]

    %iii& ;ase on the answer in %c& %i& write a #alance chemical equation for the

    reaction '.

    .........................................................................................................................

    [2 marks]

    %& alt < is solu#le in water. ;riefly escri#e a metho to o#tain the crystal of salt

    4

    reaction W

    opper%11& car#onate

    > 3297

    alt L  > gas M  > water 

    > *a93

    ;lue precipitate insolu#le in e,cess *a93

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    < from its solution.

    ................................................................................................................................

    ................................................................................................................................

    ................................................................................................................................

    [! marks]

    %e& tate the colour of copper%11& car#onate crystal forme.

    ................................................................................................................................

    [) mark]

    4. Diagram 4 shows two e,periments to investigate one factor that influences therate of a reaction.

    Diagram 4

    %a& /he reaction in the e,periment is represente #y the following equation8

    6

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      a9! %s& > 23l %aq& al2 %aq& > 92 %g& > 329 %l&

    %i& Among the proucts state in the equation which is the most suita#le to #e

    chosen to etermine the rate of reaction(

    .........................................................................................................................

    [) mark]

    %ii& tate one reason for choosing the prouct in 6%#&%i&.

    .........................................................................................................................

    [) mark]

    %c& /he results for #oth e,periments are represente #y "raph 6.

    ;ase on "raph 68%i& ompare the rate of reaction #etween e,periment 1 an e,periment 11.

    .........................................................................................................................

    [) mark]

    %ii& 'hat has happene to the reactants at time ,(

    .........................................................................................................................

    [) mark]

    %iii& 'hy are #oth curves at the same level after time ,(

    .........................................................................................................................[) mark]

    %iv& +,plain your answer in %c& %i& #y using the collision theory.

    .........................................................................................................................

    .........................................................................................................................

    .........................................................................................................................

    .........................................................................................................................

     [! marks]%& tate another factor that can affect the rate of reaction for the e,periments.

    ?

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    + Acidifed potassium manganate!""#

    Butan-1-ol

    Compound BButanoic acid

    Process $

    ................................................................................................................................

    [) mark]

    %e& Another e,periment is carrie out using e,cess calcium car#onate power an

    ilute hyrochloric aci with ifferent concentrations. ketch the curve of

    concentration of ilute hyrochloric aci against time taken to collect a fi,equantity of the prouct.

    [) mark]

    6. Diagram 6 shows a reaction scheme for an organic compoun.

     

    Diagram 6

    %a& %i& *ame process @.

    .........................................................................................................................

    [) mark]

    %ii& Draw a la#ele iagram for the set-up of apparatus to carry out process @.

    But-1-ene

    @rocess @

    > ethanoic aci

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    [2 marks]

    %iii& Draw the structural formula of #ut-)-ene that forme in process @.

      [) mark]

    %#& %i& tate one o#servation uring process .

    ........................................................................................................................

    [) mark]

      %ii& 'rite a #alance chemical equation for the reaction in @rocess .

    .........................................................................................................................

    [2 marks]

    %c& 1n another reaction a mi,ture of #utan-)-ol ethanoic aci an concentrate

    sulphuric aci are heate gently to prouce compoun ;.

      %i& *ame compoun ;

    .........................................................................................................................

    [) mark]

    %ii& Draw the structural formula of compoun ;.

    [) mark]

    %iii& tate one physical property of compoun ;.

    .........................................................................................................................

    [) mark]

    Section B [20 marks]

    B

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    Answer all the question from this section.

    ?. Diagram ?.) shows the flow map for inustrial manufacture of sulphuric aci.

    Diagram ?.)

    %a& *ame the process of manufacturing sulphuric aci in inustry.

    'rite a #alance chemical equation for step $ an step .

    [4 marks]

    %#& Diagram ?.2 shows the steps to prouce fertiliCers $ from the reaction #etween

    sulphuric aci an the prouct of 3a#er @rocess.

    %i& 'rite the chemical formula of fertiliCers $.

    [) mark]

    %ii& A farmer foun that the crops in his farm is infertile. 3is frien suggeste

    two fertiliCers to improve the fertility of the soil urea 9%*32&2 anfertiliCers $.

    hoose the #est fertiliCer for the growth of the plants. +,plain your 

    answer.

    [elative atomic mass8 E)2 9E)6 *E)7 E!2 3E)]

    [7 marks]

    %c& /a#le ?.) shows five ifferent manufacture su#stances in inustry @ an / an their uses.

    )0

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    Manufactured substances in

    industry

    Uses

    @ /o make #oats an #aminton racket

    /o make meals an statues

    /o make the #oy of aeroplanes

    /o make artificial teeth an #ones

    / /o make cooking ware an #oiling tu#e

    Table 7.1

    ;ase on /a#le ?.) state the names of @ an /.

    "ive the specific properties of each su#stances to support your answer.

    [)0 marks]

    Section C [20 marks]

    ))

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    Answer any one question from this section in this section.

    . %a& A stuent has carrie out an e,periment to construct an ionic equation for the

    formation of lea %11& ioie. even test tu#es of the same siCe were

    la#elle ) to ?. A fi,e volume of 4.0 cm!  of ).0 mol m-!  potassium

    ioie solution was poure in each test tu#e. /he volume of ).0 mol m -!

    lea%11& nitrate solution that ae is shown in /a#le . /he height of

     precipitate forme in each test tu#e was measure. /he results are shown

    in /a#le .

    Test tube 1 2 ! 7 4 6 ?

    Volue of 1.! old-"

    lead#$$% nitrate solution & c"0.4 ).0 ).4 2.0 2.4 !.0 !.4

    'ei()t of *reci*itate &c ).) 2.2 !.7 7.7 4.4 4.4 4.4

    /a#le

    %i& ;ase on /a#le plot a graph of the height of precipitate against volume of 

    lea %11& nitrate solution at page )4.

    [! marks]

    %ii& Determine the num#er of moles of lea %11& ions an ioie ions that are

    require for the formation of lea %11& ioie. our answer shoul consist of

    the following8

    • /he volume of lea %11& nitrate solution that ha reacte completely with4.0 cm! of ).0 mol m-! potassium ioie

    • alcFlate the num#er of moles of lea%11& ions an ioie ions

    • alculate the num#er of moles of ioie ions that has reacte with ) mol

    of lea%11& ions.

    • 'rite the ionic equation for the formation of lea%11& ioie.

    [? marks]

    %c& Diagram )0.! shows three reagent #ottles which contain nitric aci soium

    )2

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    hyro,ie solution an soium nitrate solution.

    /he la#el in each reagent #ottle which contains the three colourless aqueous

    solution respectively has etache.Descri#e how you carry out chemical test to verify each aqueous solution

    without using any inicator. our escription must inclue o#servations an

    conclusion.

    [)0 marks]

    B. %a& /he ta#le #elow shows the results of a test to ifferentiate #etween propanean propene.

    )!

    +a,' +a+,"'+,"

    Diagram )0.!

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    rocedure ,bseration

    ;romine water is ae to

     propene

    ;rown colour is ecolourise

    ;romine water is ae to

     propane

    ;rown colour oes not change

    ;ase on the ta#le a#ove e,plain why there is a ifference in these

    o#servations.

    'rite a #alance chemical equation for the reaction occure.

    [4 marks]

    %#& Diagram B shows structural formulae of four organic compouns.

    All four organic compouns A ; an D are colourless liquis at room

    temperature. 

    ompoun A ompoun ;

     ompoun ompoun D

    Diagram B

    %i& *ame the homologous series of compouns A ; an D.

    [7 marks]

    %ii& Another compoun + is in the same homologous series as compoun .

    'rite the molecular formula for compoun + which has five car#on atoms.

    [) mark]

    %iii& Descri#e #riefly a chemical test to ifferentiate #etween

    • ompoun A an compoun ;

    • ompoun an compoun D

    1n your answer inclue a #alance chemical equation for the reaction involve in

    your chemical tests.

    [)0 marks]

    "raph of the height of precipitate against volume of lea%11& nitrate solution

    )7

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    )6